Fig. 1. The characterization of nanomaterials: TEM images of SPNS (a) and Pd@Au (b), and UV-Vis-NIR absorption spectra (c) and photothermal rising temperature effects (d) of SPNS, SPNS-PEG, Pd@Au and Pd@Au-PEG (concentrations of nanomaterials: 50 ppm). The insets in (a and b) show the photos of SPNS and Pd@Au aqueous solutions, respectively, and the laser power density is 0.5 W cm–2 (808 nm).
